7. Check Data Input Coincidence.
a.
Set:
CH
4 VERTICAL MODE
CH 2 and CH 3
VERTICAL MODE
CH
3 VOL TS/DIV
A and B SEC/DIV
A TRIGGER SOURCE
A TRIGGER SLOPE
Off
On
.5 V (5 V with
X 1 0 probe attached)
50 ns (knob in)
CH
2
- (minus)
b. Set pulse generator
# 1
to
produce a positive 0.5-µs
pulse every 1
µs.
c.
Set pulse generator # 2
to
produce a negative 5-ns
pulse
when it receives an external trigger.
d. Set the A and B SEC/DIV
to
20 ns (knob in).
e. Set the Word Definition
of
the Word Recognizer
probe
to
BX0 0000.
f. Connect the Q and W0-W15 inputs
of
the Word
Recognizer
to
the wire on the red binding
post
of
the CH 2
input.
Performance
Check-2445A/2455A
Service
g. Push the A/B MENU button
to
select A TRIGGER
MODE.
h.
Push the upper TRIGGER MODE button
to
reinitial-
ize the auto-trigger level.
i.
Vary (increase) the pulse duration
of
pulse generator
# 2 until further increase makes the channel 3 display
stable
(>
2.5 V amplitude).
j. Push the
.1t
button.
k. Turn the
.1
REF
OR DL Y POS control
to
align the
delta reference cursor with the falling edge
of
the channel
2 signal.
I.
Tum the
.1
control
to
align the delta cursor with the
rising edge
of
the channel 2 signal.
m.
CHECK-Reading
is
;;.,,
20
ns and
,..;
85 ns.
n.
Push the
.1t
button.
o. Disconnect test setup.
4-43
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